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The medical specialty of plastic surgery is concerned with the reshaping of body tissues. The word plastic comes from the Greek plastikos, meaning "to shape" or "to form." The specialty includes both reconstructive and cosmetic surgery. Reconstructive surgery is used to repair malformed or damaged tissue or to replace lost tissue, such as from birth defects, accidents, disease, or cancer surgery. Its primary aims are to restore impaired function and to help people with deformities look as normal as possible. Cosmetic, or aesthetic, surgery is performed on normal, healthy tissue solely to make a person look younger or more attractive. A visually pleasing result is a goal of both reconstructive and cosmetic surgery, and plastic surgeons rely on their aesthetic judgment as well as their mastery of intricate surgical techniques and knowledge of wound healing.